<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>使用constructor属性来查看对象是否为数组</title>
</head>

<body>
    <p>判断是否为数组。</p>
    <p id="demo"></p>
    <script>
        var fruits = ["Banana", "Orange", "Apple", "Mango"];
        document.getElementById("demo").innerHTML = isArray(fruits);
        function isArray(myArray) {
            return myArray.constructor.toString().indexOf("Array") > -1;
        }
    </script>
</body>

</html>